A user reports that their year-old phone battery now lasts only a few hours and the handset feels warm even when sitting idle in a pocket. There is no visible physical damage. What is the BEST next step to diagnose the rapid drain?
- AReview the built-in battery usage statistics to identify any app consuming a disproportionate share in the background. Correct
- BImmediately replace the battery, since a year of charge cycles has clearly worn it out.
- CPerform a full factory reset straight away to clear whatever process is draining the battery.
- DDisable the mobile data radio permanently to stop all background network activity draining it.
Why A is correct: Warmth while idle plus rapid drain typically means a background app or rogue process is running constantly, and the usage statistics point straight to the offender before any part is replaced.
Why B is wrong: Batteries do degrade over time, but a year is early for severe wear and swapping hardware before checking software skips the cheapest and most likely cause.
Why C is wrong: A reset might clear a rogue app, but it is a heavy-handed first move that erases user data when a quick look at usage stats would isolate the cause.
Why D is wrong: Turning off mobile data may reduce some drain, but it cripples the phone's core function and masks rather than diagnoses the actual culprit.